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DE4237005A1 - Reducing differences in sound level at receiver - comparing characteristic vol. of currently received programme signal with that of programme signal to be received - Google Patents

Reducing differences in sound level at receiver - comparing characteristic vol. of currently received programme signal with that of programme signal to be received

Info

Publication number
DE4237005A1
DE4237005A1 DE19924237005 DE4237005A DE4237005A1 DE 4237005 A1 DE4237005 A1 DE 4237005A1 DE 19924237005 DE19924237005 DE 19924237005 DE 4237005 A DE4237005 A DE 4237005A DE 4237005 A1 DE4237005 A1 DE 4237005A1
Authority
DE
Germany
Prior art keywords
program
received
characteristic value
signal
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19924237005
Other languages
German (de)
Inventor
Georg Plenge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut fuer Rundfunktechnik GmbH
Original Assignee
Institut fuer Rundfunktechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institut fuer Rundfunktechnik GmbH filed Critical Institut fuer Rundfunktechnik GmbH
Priority to DE19924237005 priority Critical patent/DE4237005A1/en
Publication of DE4237005A1 publication Critical patent/DE4237005A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/13Arrangements for device control affected by the broadcast information
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers
    • H03G3/20Automatic control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/3005Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/3026Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H2201/00Aspects of broadcast communication
    • H04H2201/10Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/802Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving processing of the sound signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Characteristic values concerning the respective average volume of receivable programme signals are made available at the receiver side. The characteristic value of the programme which is already being received is compared with the characteristic value of a programme to be received. By establishing a characteristic value difference the reproduction level of the programme signal to be received is adjusted so that the programme signal to be received is reproduced with approximately the same volume as the currently received programme signal or with a level difference given by an adjustment value pre-specified by the user. ADVANTAGE - Reduces volume differences between recorded and/or radio transmitted audio signals on switching between programme signals to avoid jumps in volume levels.

Description

Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method according to the preamble of claim 1.

Bei der Nutzung von Rundfunkgeräten für die Wiedergabe von Hörrundfunk- oder Fernsehprogrammen gegebenenfalls auch in Kombination mit gespeicherten Bild- und/oder Tonsignalen ist meistens mit dem Wechsel von einem zu einem anderen Programm ein Sprung in der Wiedergabelautstärke der Programmsignale bzw. der gespeicherten Tonsignale verbunden. Dieser plötzliche Wechsel ist sehr störend.When using radio equipment for the reproduction of Radio or television programs, if necessary, also in Combination with stored picture and / or sound signals mostly with the change from one program to another a jump in the playback volume of the program signals or of the stored sound signals connected. This sudden change is very annoying.

Die Aufgabe der Erfindung besteht demgegenüber darin, Pegelsprünge und deren unangenehme Folgen beim Wechsel zwischen gespeicherten und/oder rundfunkmäßig übertragenen Audio- Programmsignalen zu vermeiden.In contrast, the object of the invention is Level jumps and their unpleasant consequences when switching between stored and / or broadcast audio To avoid program signals.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the characterizing Features of claim 1 solved.

Die erfindungsgemäß verwendeten Kennwerte können auf verschiedene Weise gewonnen werden, wie in den Unteransprüchen beschrieben ist. The characteristic values used according to the invention can be based on can be obtained in different ways, as in the subclaims is described.  

Die Erfindung geht davon aus, daß ein Kennwert über die mittlere und/oder aktuelle Lautstärke der Audio-Programmsignale vorliegt, zwischen denen der Empfänger wechseln kann. Diese Kennwerte sind entwederThe invention is based on the fact that a characteristic value is about the mean and / or the current volume of the audio program signals is present, between which the recipient can switch. These are characteristic values either

  • -Zusatzinformationen zu den Programmsignalen, die in dafür vorgesehenen Datenwegen (Radio-Daten-System RDS, Datenzeilen in Videosystemen, Datenkapazitäten in Speichermedien wie z. B. Kompakt-Disc) zur Verfügung stehen. Diese sind von den Rundfunkprogrammveranstaltern für ihre Programme vor der Übertragung ermittelt worden und vor der Übertragung in den dafür vorgesehenen Datenstrom eingegeben bzw. von den Herstellern der Speichermedien ermittelt und in den dafür vorgesehenen Datenbereichen abgelegt worden;-Additional information to the program signals used for this provided data paths (radio data system RDS, Data lines in video systems, data capacities in Storage media such as B. compact disc) available stand. These are from the broadcasters have been identified for their programs prior to transmission and before the transfer to the designated data stream entered or by the manufacturers of the storage media determined and in the designated data areas been filed;
  • - aus anderen Zusatzinformationen abgeleitet worden. Dazu zählen insbesondere die rundfunkmäßig übertragene Programmtypinformation (PTY) und die Stellgröße über die Variable Dynamik. Bei der Auswertung der PTY-Information kann davon ausgegangen werden, daß bestimmte Programmtypen mit einer typischen Aussteuerung bzw. resultierenden Lautstärke des Programms verknüpft sind. Diese Kennwerte sind statisch und nur generell richtig. Im Einzelfall können sich ungünstige Überschneidungen bei der Auswertung dieser Informationen ergeben. Das Stellsignal über die Variable Dynamik ist für die Ableitung der Kennwerte geeignet, weil dieses Stellsignal dazu dient, dem Hörer die Wahl einer seinen Wünschen angepaßten Dynamik zu ermöglichen. Dieses Stellsignal repräsentiert die Hüllkurve des aktuellen Pegelverlaufs des Programmsignals und somit auch die resultierende Wiedergabelautstärke. Es ist also besonders gut für die Ableitung eines stets aktuell gültigen Kennwertes geeignet.- derived from other additional information. To count in particular those broadcast by radio Program type information (PTY) and the manipulated variable via the Variable dynamics. When evaluating the PTY information can be assumed that certain Program types with a typical modulation or resulting volume of the program are linked. These parameters are static and only generally correct. in the In individual cases there may be unfavorable overlaps in the Evaluation of this information result. The control signal is about the variable dynamics for deriving the Characteristic values suitable because this control signal serves the Listener the choice of a dynamic adapted to his wishes to enable. This control signal represents the envelope  the current level curve of the program signal and thus also the resulting playback volume. So it is especially good for deriving a currently valid one Suitable characteristic value.

Falls keine Kennwerte aus Zusatzinformationen (PTY, direkt übertragener Kennwert Stellgröße über die Variable Dynamik) zur Verfügung stehen, kann der Empfänger die Kennwerte auch durch laufende Signalstatistik aus den empfangbaren Signalen gewinnen. Es steht im Belieben der Hersteller von Empfängern, diese Möglichkeit für Programme vorzusehen, bei denen beispielsweise mit der Mitsendung von Zusatzinformationen kaum zu rechnen ist, insbesondere bei LW, MW und KW. Dem Empfängerbauer stehen also eine Reihe von Möglichkeiten für das Erzielen einer besseren Lautstärkebalance zwischen rundfunkmäßig übertragenen und/oder gespeicherten Audio-Programmsignalen zur Verfügung. Sie unterscheiden sich in Wirksamkeit und Aufwand. Die beste Quelle für die Ermittlung der Kennwerte sind sie Stellsignale über die Variable Dynamik, die nächstbeste vom Programmanbieter mitgesendeten Kennwerte, schließlich die Nutzung der Programmarteninformation. Den höchsten Aufwand bedeutet die laufende Signalstatistik der empfangbaren Programmsignale. Sie kann dadurch erfolgen, daß mit einem sogenannten Hintergrundempfänger das empfangene und die empfangbaren Rundfunk-Programmsignale laufend stichprobenartig auf ihren Pegelverlauf überprüft werden und aus diesen Stichprobenwerten ein Kennwert ermittelt wird. Diese Methode ist in ihrem Erfolg für die Kennwertermittlung mit der Nutzung des Stellsignals für die Variable Dynamik vergleichbar.If no parameters from additional information (PTY, direct transmitted characteristic value manipulated variable via the variable dynamics) Are available, the recipient can also use the characteristic values Obtain current signal statistics from the receivable signals. It is at the discretion of the manufacturer of receivers, this possibility to be provided for programs in which, for example, the Sending additional information is hardly to be expected, especially for LW, MW and KW. Stand by the receiver builder So a number of ways to get a better one Volume balance between broadcast and / or stored audio program signals are available. they differ in effectiveness and effort. The best source for the determination of the characteristic values are control signals via the variable Dynamics, the next best broadcast by the program provider Characteristic values, finally the use of the program type information. The current signal statistics of the receivable program signals. It can be done by using a so-called background receiver the received and the receivable broadcast program signals continuously on a random basis be checked for their level curve and from these A characteristic value is determined. This method is in their success for the determination of characteristic values with the use of the Control signal for the variable dynamics comparable.

Die Erfindung wird anhand eines Ausführungsbeispiels in der einzigen Zeichnung näher erläutert. Die Figur zeigt ein Blockschaltbild einer Schaltungsanordnung zur Durchführung des erfindungsgemäßen Verfahrens.The invention is based on an embodiment in the single drawing explained in more detail. The figure shows a  Block diagram of a circuit arrangement for performing the inventive method.

Wie aus der Figur ersichtlich ist, weist ein Audiogerät 90 eingebaute Rundfunkempfangsteile sowie Wiedergabeteile für Tonsignalspeicher wie beispielsweise Kassetten oder Kompakt-Discs auf. Dabei wird für die erfindungsgemäßen Zwecke davon ausgegangen, daß das Audiogerät 90 einen oder mehrere Ausgänge 91 bis 94 fürAs can be seen from the figure, an audio device 90 has built-in radio reception parts and playback parts for sound signal memories such as cassettes or compact discs. It is assumed for the purposes of the invention that the audio device 90 one or more outputs 91 to 94 for

  • - direkt übertragene Pegelkennwerte (Ausgang 91),- directly transmitted level parameters (output 91 ),
  • - Programmarteninformationen (PTY; Ausgang 92),- program type information (PTY; output 92 ),
  • - Steuersignale für die Variable Dynamik (DRC = Dynamic Range Control; Ausgang 93), oder- Control signals for the variable dynamic range (DRC = Dynamic Range Control; output 93 ), or
  • - für einen durch stichprobenartige Analyse des empfangenen und weiterer empfangbarer Programme mittels Hintergrundempfänger gewonnenen mittleren Pegelwert (Ausgang 94)for an average level value obtained by random analysis of the received and further receivable programs by means of a background receiver (output 94 )

auf.on.

Die Ausgänge 91 bis 94 führen zu einer Stufe 10, welche aus diesen Informationen die Kennwerte übernimmt (Ausgang 91) bzw. ermittelt (Ausgänge 92 bis 94). Die Kennwerte werden von der Stufe 10 über den Signalweg 15 einem Kennwertespeicher 20 zugeführt, wo sie abgelegt werden. Für den Umschaltprozeß mit angepaßter Laut­ stärkebalance zwischen dem gerade wiedergegebenen Programmsignal und dem neu wiederzugebenden Programmsignal ist eine Auswahlstufe 30 vorgesehen, welcher eine Information 51 von einer Programmwahlstufe 50 über das gewählte Programmsignal erhält. Entsprechend dieser Information 51 liest die Auswahlstufe 30 aus dem Speicher 20 den zugehörigen Kennwert aus. Sobald der Hörer über die Programmwahlstufe 50 ein neues Programmsignal wählt, wird durch die Auswahlstufe 30 der zum neuen Programm gehörige Kennwert aus dem Speicher 20 abgerufen. Die Programmwahlstufe 50 veranlaßt über den Signalweg 52 das Audiogerät 90, auch das neu gewählte Programmsignal aufzuschalten, das über den Signalweg 82 der Umschaltstufe 80 zugeführt wird. Die Umschaltstufe 80 schaltet dann von dem bisher empfangenen, über den Signalweg 81 zugeführten Programmsignal auf das neue, über den Signalweg 82 zugeführte Signalprogramm um. Die Umschaltstufe 80 kann auch in dem Audiogerät 90 integriert sein; in diesem Falle sind die Signalwege 81 und 82 sowie die Umschaltstufe 80 entbehrlich. Eine der Auswahlstufe 30 nachgeschaltete Verarbeitungsstufe 40 ermittelt einen Pegelkorrekturwert aus den beiden, von der Auswahlstufe 30 über den Signalweg 31 zugeführten Kennwerte für das bisher empfangene und das neuzuempfangende Programmsignal, und zwar gegebenenfalls unter Berücksichtigung einer weiteren Gewichtung, die vom Hörer durch vorherige Eingabe in eine Stufe 60 erfolgt. Der Pegelkorrekturwert wird über den Signalweg 41 einer Regelstufe 70 zugeführt, welche den Pegel des von der Schaltstufe 80 über den Signalweg 83 zugeführten Tonsignals entsprechend regelt.The outputs 91 to 94 lead to a stage 10 , which takes the characteristic values from this information (output 91 ) or determines them (outputs 92 to 94 ). The characteristic values are fed from the stage 10 via the signal path 15 to a characteristic value memory 20 , where they are stored. A selection stage 30 is provided for the switching process with an adjusted volume balance between the program signal currently being reproduced and the program signal to be replayed, which receives information 51 from a program selection stage 50 about the selected program signal. In accordance with this information 51 , the selection stage 30 reads out the associated characteristic value from the memory 20 . As soon as the listener selects a new program signal via the program selection stage 50 , the characteristic value belonging to the new program is retrieved from the memory 20 by the selection stage 30 . The program selection stage 50 causes the audio device 90 , via the signal path 52 , to also switch on the newly selected program signal, which is fed to the switching stage 80 via the signal path 82 . The switching stage 80 then switches from the previously received program signal supplied via the signal path 81 to the new signal program supplied via the signal path 82 . The switching stage 80 can also be integrated in the audio device 90 ; in this case the signal paths 81 and 82 and the switching stage 80 are unnecessary. A processing stage 40 downstream of the selection stage 30 determines a level correction value from the two characteristic values supplied by the selection stage 30 via the signal path 31 for the previously received and the newly received program signal, if necessary, taking into account a further weighting, which the listener has made by inputting a previous one Level 60 is done. The level correction value is fed via the signal path 41 to a control stage 70 , which regulates the level of the sound signal supplied by the switching stage 80 via the signal path 83 .

Claims (5)

1. Verfahren zur empfangsseitigen Verringerung von Lautstärkeunterschieden zwischen gespeicherten und/oder rundfunkmäßig übertragenen Audio-Programmsignalen beim Wechsel zwischen diesen Programmsignalen, dadurch gekennzeichnet, daß empfangsseitig Kennwerte über die jeweilige mittlere Lautstärke der empfangbaren Programmsignale verfügbar gemacht werden, daß der Kennwert des bisher empfangenen Programms mit dem Kennwert des neu zu empfangenden Programms verglichen wird und daß bei Feststellung einer Kennwertedifferenz der Wiedergabepegel des neu zu empfangenden Programmsignals so eingestellt wird, daß das neu zu empfangende Programmsignal mit etwa gleicher Lautstärke wie das bisher empfangene Programmsignal oder mit einer vom Hörer durch Vorgabe eines Stellwertes vorgegebenen Pegeldifferenz wiedergegeben wird. 1. Method for reducing the volume differences between stored and / or broadcast audio program signals on the receiving end when changing between these program signals, characterized in that on the receiving side parameters about the respective average volume of the receivable program signals are made available that the characteristic value of the previously received program with the characteristic value of the new program to be received is compared, and that when a characteristic value difference is found, the reproduction level of the new program signal to be received is set so that the new program signal to be received is at approximately the same volume as the previously received program signal or with one received by the listener by specifying a manipulated variable predetermined level difference is reproduced. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im Falle von rundfunkmäßig übertragenen Programmsignalen der jeweilige Kennwert aus den mit den Programmsignalen ausgesendeten Programmtypinformationen (PTY) abgeleitet wird.2. The method according to claim 1, characterized in that in In the case of radio broadcast program signals from respective characteristic value from the with the program signals transmitted program type information (PTY) becomes. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß im Falle von rundfunkmäßig übertragenen Programmsignalen der jeweilige Kennwert über die mittlere Lautstärke sendeseitig ermittelt und als Begleitinformation zu dem betreffenden Programmsignal hinzugefügt wird.3. The method according to claim 1, characterized in that in In the case of radio broadcast program signals from respective characteristic value via the medium volume on the transmission side determined and as accompanying information to the concerned Program signal is added. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der jeweilige Kennwert aus der als Begleitinformation dem jeweiligen Programmsignal zugeordneten Stellgröße für die Variable Dynamik gewonnen wird, welche in einem direkten Zusammenhang zum aktuellen Programmsignalpegel und damit indirekt zur erwartenden Lautstärke des Programmsignals steht.4. The method according to claim 1, characterized in that the respective characteristic value from the as accompanying information control signal assigned to the respective program signal for the Variable dynamics are gained, which in a direct Relationship to the current program signal level and thus indirectly to the expected volume of the Program signal stands. 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der mittlere und/oder aktuelle Pegel des jeweiligen Programmsignals durch empfangsseitige Analyse des Pegelverlaufs ermittelt wird und für die Ableitung des jeweiligen Kennwertes herangezogen wird.5. The method according to claim 1, characterized in that the average and / or current level of the respective Program signal by receiving analysis of the Level curve is determined and for the derivation of the the respective characteristic value is used.
DE19924237005 1992-11-02 1992-11-02 Reducing differences in sound level at receiver - comparing characteristic vol. of currently received programme signal with that of programme signal to be received Withdrawn DE4237005A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924237005 DE4237005A1 (en) 1992-11-02 1992-11-02 Reducing differences in sound level at receiver - comparing characteristic vol. of currently received programme signal with that of programme signal to be received

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924237005 DE4237005A1 (en) 1992-11-02 1992-11-02 Reducing differences in sound level at receiver - comparing characteristic vol. of currently received programme signal with that of programme signal to be received

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DE4237005A1 true DE4237005A1 (en) 1994-05-05

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727272A1 (en) * 1994-11-23 1996-05-24 Serge Saadoun DEVICE FOR AUTOMATICALLY ADAPTING THE MEDIUM SOUND LEVEL OF A TELEVISION RECEIVER
DE19809522A1 (en) * 1998-03-05 1999-09-09 Volkswagen Ag Radio receiver with RDS overcomes difficulty of setting travel announcement amplitudes
DE10316814A1 (en) * 2003-04-11 2004-10-21 Volkswagen Ag Radio particularly for road vehicles has two tuners operating with correction values in memory to provide uniform sound volume output
WO2005074129A3 (en) * 2004-01-28 2005-10-20 Koninkl Philips Electronics Nv Automatic audio signal dynamic range adjustment
WO2005104360A1 (en) * 2004-04-21 2005-11-03 Imagination Technologies Limited Radio receiver volume control system
EP1681765A3 (en) * 2005-01-13 2007-01-03 Delphi Technologies, Inc. Audio automatic volume control
DE102004055738B4 (en) * 2004-11-18 2010-11-04 Fachhochschule Jena Signal processing unit and signal processing method
DE102010003306A1 (en) * 2010-03-25 2011-09-29 Bayerische Motoren Werke Aktiengesellschaft Device for use in radio of motor car for controlling volume of different audio signals of e.g. TV transmitter, has memory unit with volume control information used for controlling volume of selected audio signal during selection of signal

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727272A1 (en) * 1994-11-23 1996-05-24 Serge Saadoun DEVICE FOR AUTOMATICALLY ADAPTING THE MEDIUM SOUND LEVEL OF A TELEVISION RECEIVER
WO1996016511A1 (en) * 1994-11-23 1996-05-30 Serge Saadoun Device for automatic adaptation of the average sound level of a television set
US5631714A (en) * 1994-11-23 1997-05-20 Serge Saadoun Apparatus for automatically adapting the mean sound level of a television receiver
DE19809522A1 (en) * 1998-03-05 1999-09-09 Volkswagen Ag Radio receiver with RDS overcomes difficulty of setting travel announcement amplitudes
DE19809522B4 (en) * 1998-03-05 2007-11-08 Volkswagen Ag Broadcast receiver and method of operating the same
DE10316814A1 (en) * 2003-04-11 2004-10-21 Volkswagen Ag Radio particularly for road vehicles has two tuners operating with correction values in memory to provide uniform sound volume output
WO2005074129A3 (en) * 2004-01-28 2005-10-20 Koninkl Philips Electronics Nv Automatic audio signal dynamic range adjustment
WO2005104360A1 (en) * 2004-04-21 2005-11-03 Imagination Technologies Limited Radio receiver volume control system
DE102004055738B4 (en) * 2004-11-18 2010-11-04 Fachhochschule Jena Signal processing unit and signal processing method
EP1681765A3 (en) * 2005-01-13 2007-01-03 Delphi Technologies, Inc. Audio automatic volume control
DE102010003306A1 (en) * 2010-03-25 2011-09-29 Bayerische Motoren Werke Aktiengesellschaft Device for use in radio of motor car for controlling volume of different audio signals of e.g. TV transmitter, has memory unit with volume control information used for controlling volume of selected audio signal during selection of signal
DE102010003306B4 (en) 2010-03-25 2025-06-26 Bayerische Motoren Werke Aktiengesellschaft Automatic volume control taking into account different audio signals

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